Analog Technologies TEC28V15A. High Voltage High Current TEC Controller

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1 FEATURES Analog Technologies Figure 1. Physical Photo of Figure 2. Physical Photo of Built-in Smart Auto PID Control the World s First High Output Voltage: 28V High Output Current: 15A High Efficiency: > VPS = 28V & V TEC = 14V & I TEC = 15A High Temperature Stability: <±0.001 C Low Thermistor Injection Current: < 1µA Continuous Bi-directional Output Programmable Output Current and Voltage Limits Real Time Temperature, Current and Voltage Signals Selectable Temperature Sensor Types: thermistor, RTD, or temperature sensor IC High Reliability and Zero EMI Compact Size: (mm) 100 % lead (Pb)-free and RoHS compliant APPLICATIONS Driving high power TEC modules at high efficiency. DESCRIPTION TEC (Thermo-Electric Cooler) is a semiconductor device which can cool down or heat up the temperature of an object by injecting an electrical current in one or the other direction. This TEC controller,, is designed to drive a TEC at high efficiency for regulating the object temperature precisely by controlling the direction and magnitude of the current going through the TEC. It is powered by a DC voltage between 5V to 28V and output current can go up to 15A without using a heat sink. Figure 1 and Figure 2 are photos of the actual controller D, one shows the signal pins, and the other shows the power pins. The controller allows setting the set-point temperature, maximum output voltage magnitude, and the maximum output current magnitude respectively. These three settings are the input parameters for the three control loops: constant temperature, constant current, and constant voltage. Before hitting the maximum output voltage magnitude or the maximum output current magnitude, the temperature loop is in control. When hitting the maximum output voltage magnitude, either outputting a positive or negative value across the TEC, the voltage loop takes over the control, the controller will be outputting a constant voltage to the TEC; when hitting the maximum output current magnitude, the current loop takes over the control, the controller will be outputting a constant output current to the TEC. The highest output voltage magnitude is limited by the maximum power supply voltage, and the maximum output current magnitude is 15A. The temperature signal can be obtained by using one of these 3 temperature sensors: thermistor, RTD or temperature sensor IC. When using a thermistor, the set-point temperature range is determined by an external temperature network formed by 3 resistors. In order to reduce the injection current to the thermistor to reduce the errors caused by the self-heating effect, the injection current is provided in pulse mode, reducing the current by 10 times as opposed to a continuous current. One advanced feature of this TEC controller is that it comes with a smart auto PID control micro-processor, it continuously senses and compensates the thermal load automatically. No need to use any external components for forming a compensation network, nor requires tuning.* *Firmware PID control not available for now. Conservative users can still select using the conventional analog compensation network. The same as in the past, it requires a onetime pre-tuning the network to match the thermal load, but provides reliable and high accuracy control. For fixed thermal load applications, conventional analog compensation can be selected; while for applications with variable or multiple different thermal loads one type at a time, the automatic PID control is more suitable. Copyrights , Analog Technologies, Inc. All Rights Reserved. Updated on 5/17/

2 Figure 3 is the top view of the controller, showing the pin names and the locations. There are totally 32 pins in 2mm pitch. All the pins on the left are for either control input or indication output signals; all the right pins are power input or output. The pin function details are given in Table 1. At the thermistor input, there is a linearization circuit for the thermistor, to make the temperature output voltage be more linearly proportional to the actual thermistor temperature. There is a voltage inverter circuit, and it makes the temperature output voltage be positively proportional to the temperature, since the thermistor has a negative temperature coefficient. These 2 circuits together is called temperature measurement circuit. See Figure 7. The set-point temperature voltage and the voltage representing the actual temperature are sent to an error amplifier. There is a compensation network inserted in the loop, to stop the oscillation of the controller caused by phase delay effects of the thermal load. Therefore, the compensation network must match the need for driving a particular thermal load. To simplify the tuning, a tunable compensation network is provided by the evaluation board for this TEC controller. A detailed guidance about how to tune the compensation network with a thermal load is given in the evaluation board application note. SPECIFICATIONS Table 1. Pin Function Descriptions Pin # Name Note Description Figure 3. Pin Names and Location 4VRS Analog output 4VR switch output. This pin outputs a switching pulse 4VR signal, from 0V to 4V, 85Hz, as a reference for the thermistor. 1* SNCO Digital output Synchronization output. This pin outputs a switching pulse signal, from 0V to 5V, 600kHz. It can be sent to the synchronization input of another SM (Switch Mode) controller or power supply, to eliminate the beating interference between this TEC controller and the other SM device. 2 TMGD Digital output Temperature good indication. Active high. Indicates when actual temperature equals to the set-point temperature of the target object. That is, the target object temperature is within C away from the set-point temperature, provided the set-point temperature range is 40 C. Or V TMO V TMS < 0.5mV. 3 SBDN Analog /Digital input Standby and shut down control. This SBDN pin is internally floated and series with 1k resistor. It s suggested to pull this pin up to VPS power supply by a 4.99MΩ resistor. If pulled to ground, it shuts down the entire controller. This pin has 2 threshold voltages: 1.5V and 2.0V. See Figure 6. SHUT DOWN: V SBDN < 0.3V, the controller is set to non-working state. STANDBY: 1.9V>V SBDN >1.5V, all components is set to working state except the output stages for TEC+ and TEC. Copyrights , Analog Technologies, Inc. All Rights Reserved. Updated on 5/17/

3 OPERATION: V SBDN > 2.0V, the whole controller is set to working state. 4 GND Ground 5 4VR Analog output 6 TMS Analog input Signal ground. Connect this pin to the signal ground of ADCs, DACs, the signal sources, and as it as analog output pin ground. Reference voltage output, 4.096V. It can be used as the voltage reference by the potentiometers or DACs for setting the analog ports, such as TMS, ILM, VLM, etc. It can also be used by ADCs for sensing the analog output ports: TMO, CTMO, ITEC and VTEC. The initial accuracy is 0.1%, and the temperature coefficient is <50ppm/ C max. Analog Input port for setting the set-point temperature for the target object. It is internally tied a 1MΩ resistor to the half value of the reference voltage, 2V. The open circuit voltage of this pin is thus 2V, corresponding to a set-point temperature of 25 C by using the default temperature network (with the set-point temperature range being from 15 C to 35 C). It is highly recommended to set this pin s voltage by using the controller s 4V voltage reference. This pin can be set by using a POT or DAC. When the set-point temperature needs to be at 25 C, leave this pin unconnected. 7 IN+ Analog input Receive external temperature signal (thermistor and temperature sensor, etc.) 8 RTH Analog input 9 TMO Analog output Thermistor connection port. Connect to the thermistor which is mounted on the target object for sensing its temperature. By using the default internal temperature network, a 25 C thermistor can be used. Other type of thermistors or temperature sensors can also be used, see the application section for details. Actual target object temperature indication. It swings from 0V to 4V. By using a default internal temperature network, it represents 15 C to 35 C when this pin s voltage swings 0.1V to 3.9V linearly, provided a standard 10kΩ thermistor is used as the temperature sensor device. 10 CMIN Analog input Compensation input pin for the thermal control loop. 11 IDR Analog input and output This voltage is derived from the temperature error detection circuit and used as the input control signal of the current loop for the TEC. Its internal impedance is 10kΩ and can be over-driven by an external analog signal which is able to over-ride the 10kΩ resistor. The voltage range is from 0V to 4V, corresponding to 15A to +15A output current. Setting this pin voltage to 2V forces the output current to zero. 12 ILM Analog input This pin sets the TEC Current Limit. The maximum limit current is 15A. Setting this pin s voltage from 0V to 4V corresponds to setting the current magnitude limit from 0A to 15A: V ILM = I OUT ( A) MAX 3.75 Copyrights , Analog Technologies, Inc. All Rights Reserved. Updated on 5/17/

4 13 VLM Analog input 14 ITEC Analog output 15 VTEC Analog output 16 CTMO Analog output This pin sets the TEC voltage Limit. The maximum limit voltage is 30V. Setting this pin s voltage from 0V to 4V corresponds the TEC voltage magnitude limit VTEC+ V being from 0 to 30V: V VLM = TEC MAX 7.5 TEC current indication. ITEC is an analog voltage output pin with a voltage proportional to the actual current through the TEC. ITEC s center voltage is 2V, corresponding to zero current through the TEC. V ITEC = I OUT (A) +2V, where I OUT is the actual output current of the controller, 7.5 flowing out from TEC+ port and flowing in to TEC pin. TEC voltage indication. VTEC is an analog voltage output pin with a voltage proportional to the actual voltage across the TEC. It swings from 0V to 4V to indicate the output voltage being from 30V to 30V, so the center voltage is 2V. V VTEC = V TEC + V TEC +2V 15 The controller internal temperature indication output. It can be used for sensing the actual temperature of the controller, to avoid over-heating. 17, 18, 19, 20 TEC+ Analog power output This pin is for connecting to the positive terminal of the TEC module, all the 4 pins are internally connected for increasing the current capability. 21, 22, 23, 24 PGND Power ground Power ground for connecting to the power supply 0V return node, all the 4 pins are internally connected. 25, 26, 27, 28 TEC Analog power output This pin is for connecting to the negative terminal of the TEC module, all the 4 pins are internally connected. 29, 30, 31, 32 VPS Power input Power supply voltage positive node. The normal operating voltage range is 5V to 28V, the maximum value is 30V. All the 4 pins are internally connected. *There are two part numbers for selection, and SNCO. The former s pin 1 is 4VRS, and the latter s pin 1 is SNCO. It s recommended to use. Copyrights , Analog Technologies, Inc. All Rights Reserved. Updated on 5/17/

5 Table 2. Electrical characteristics. Parameter Symbol Conditions Min. Typ. Max. Units Reference Voltage Pulse Output Mode: 4VRS pin ( Or Synchronization Output: SNCO pin), pin 1 Output Range V 4VRSOUT T A = 25 C V Initial Error V E T A = 25 C % Temperature Coefficient T C ±3 ±8 ppm/ C Maximum Load Current I 4VRMAX T A = 25 C ma Switch frequency F 4VRS Hz Output Voltage (Open circuit) V SNCOOUT Open circuit voltage = 0V ~ 4V PWM 0 4 V Voltage Range (with load) V SNCOOUT Open circuit voltage = 0V ~ 4V PWM V Frequency F SNCO Open circuit voltage = 0V ~ 4V PWM 600 khz Temperature Good Indication: TMGD pin, pin 2 Voltage Range (Open circuit) V TMGDOUT Open circuit voltage = 4V 0 4 V Voltage Range (with load) V TMGDOUT Open circuit voltage = 4V 0 4 V Maximum Sourcing Current I TMGDSC Open circuit voltage = 4V 1 15 ma Maximum Sourcing Voltage V TMGDSC Open circuit voltage = 4V V Maximum Sinking Current I TMGDSK Open circuit voltage = 4V 3 20 ma Maximum Sinking Voltage V TMGDSK Open circuit voltage = 4V V Standby Shutdown Control: SBDN pin, pin 3 V SBDN = 0V Input Current I SBDNIN V SBDN = 4V 4 6 µa V SBDN = 30V Input Voltage Range V SBDNIN Open circuit voltage = 5V 0 28 V Shutdown Logic Low V SBDNSDL Open circuit voltage = 5V 0 V Shutdown Logic High V SBDNSDH Open circuit voltage = 5V 0.7 V Standby Logic Low V SBDNSBL Open circuit voltage = 5V 1.4 V Standby Logic High V SBDNSBH Open circuit voltage = 5V 1.9 V Copyrights , Analog Technologies, Inc. All Rights Reserved. Updated on 5/17/

6 Operation Logic Low V SBDNOPL Open circuit voltage = 5V 2.0 V Operation Logic High V SBDNOPH Open circuit voltage = 5V 5 V Reference Voltage Output: 4VR pin, pin 5 Output Range V 4VROUT T A = 25 C V Initial Error V E T A = 25 C 0.05 % Temperature Coefficient T C T A = 40 C ~ 125 C 3 8 ppm/ C Maximum Load Current I 4VRMAX T A = 25 C ma Maximum Load Capacitance C 4VRMAX uf Temperature Set: TMS pin, pin 6 Input Impedance (See Figure 4 in Page 8 for input equivalent circuit) Z TMSIN 5 MΩ Input Voltage Range V TMSIN 0 4 V Open Circuit Voltage V TMSOP 2 V Temperature Signal Input: IN+ pin, pin 7 Input Range V IN+ 0 4 V Thermistor Connection Port: RTH pin, pin 8 Input Range V RTHIN 0 4 V Actual Target Object Temperature Indication: TMO pin, pin 9 Output Range V TMOOUT R LOAD = 10kΩ to 2V 40 C T A +125 C 0 4 V Output Current I TMOOUT V SS = 0V T A = 25 C ma Compensation Input: CMIN pin, pin 10 Input Range V CMIN R LOAD = 10kΩ to 2V 40 C T A +125 C 0 4 V Input Current I CMIN 40 C T A +125 C pa Compensation Output: IDR pin, pin 11 Output Range V IDROUT R LOAD = 10kΩ to 2V 40 C T A +125 C 0 4 V Copyrights , Analog Technologies, Inc. All Rights Reserved. Updated on 5/17/

7 TEC Current Limit: ILM pin, pin 12 Input Impedance Z ILM 21 kω Input Voltage Range V ILMIN 0 4 V TEC Voltage Limit: VLM pin, pin 13 Input Impedance (See Figure 5 in Page 8 for input equivalent circuit) Z VLM 10 kω Input Voltage Range V VLMIN 0 4 V TEC Current Indication: ITEC pin, pin 14 TEC Voltage Indication: VTEC pin, pin 15 Controller Temperature Indication: CTMO pin, pin 16 Output Range V CTMO T A = 25 C 0 4 V Maximum Load Current I CTMOOUT T A = 25 C ma TEC+/TEC pin, pin 17~20/pin 25~28 Maximum Output Current I MAXTEC+ I MAXTEC- V PS = 9V~28V T A = 25 C 0 15 A Maximum Output Voltage V OUTMAX V VPS = 28V 0 28 V Power Supply Input: VPS pin, pin 29~32 Input Range V VPS 5 28 V I VPS Operation mode A Input Current I VPSSB Standby mode 5 20 ma I VPSSD Shutdown mode 50 µa Temperature Stability Temperature Error Voltage V TMO V TMS mv V VPS = 28V Efficiency η V TEC+ V TEC = 14V I TEC+ I TEC = 15A 92 % Case Operating Temperature Range T CS C Ambient Operating Temperature Range T A C Storage Temp. Range T STG C Copyrights , Analog Technologies, Inc. All Rights Reserved. Updated on 5/17/

8 Controller Case Thermal Resistance R TH 9 C /W This TEC controller can only drive the TECs having >1Ω impedance, which equals V MAX / I MAX. Figure 4. TMS Input Equivalent Circuit Figure 5. VLM Input Equivalent Circuit The switch S2 is heating, and cooling V SB-SD : Going down logic low from standby to shutdown V SD-SB : Going up logic high from shutdown to standby V OP-SB : Going down logic low from operation to standby V SB-OP : Going up logic high from standby to operation Figure 6. Controller States Copyrights , Analog Technologies, Inc. All Rights Reserved. Updated on 5/17/

9 BLOCK DIAGRAM The block diagram of the controller is shown in Figure 7. Temperature Measurement Circuit Temperature Output Voltage Error Amplifier With Compensation Network Current Control Output Bi-directional Current Output H-Bridge TEC Output Voltage Control Circuit Current Limit Control Circuit Set-point Temp. Temperature Temp. Good Monitor Indication Circuit Temp. Output Figure 7. TEC Controller Block Diagram Copyrights , Analog Technologies, Inc. All Rights Reserved. Updated on 5/17/

10 APPLICATIONS TEC controller connections are shown in Figure 8. 4V pules voltage reference 1 4VRS VPS 32 To microprocessor From microprocessor 2 3 TMGD SBDN VPS VPS V ~ 28V 4 GND VPS 29 Thermistor Compensation network Voltage reference W1 20k Clock wise RD To external signal R3 W2 W3 R1 CD R2 RI RP CI Clock wise 20k Clock wise 20k To ADC VR TMS IN+ RTH TMO CMIN IDR ILM VLM ITEC PGND PGND PGND PGND TEC TEC TEC TEC TEC+ TEC To power GND TEC To ADC 15 VTEC TEC+ 18 To ADC 16 CTMO TEC+ 17 Figure 8. TEC Controller Connection Copyrights , Analog Technologies, Inc. All Rights Reserved. Updated on 5/17/

11 SBDN Table 3. External Detector Selection. No. Input Voltage External Detector 1 SBDN 0V ~ 0.5V SD 2 SBDN 1.5V ~ 1.9V SB 3 SBDN 2V ~ 2.3V Temperature sensor 4 SBDN 2.4V ~ 2.7V RTD/RTH 5 SBDN 2.8V ~ 4V RTH(pulse mode) Temperature Sensor Selections There are usually three temperature sensors, thermistor, RTD (Resistance Temperature Detector), and IC (Integrated Circuit) temperature sensors. 1. Thermistor Figure 9. Thermistor To achieve the required V TMO outputs at the three different setting point temperatures in the Temperature Network, use the equation: R ( ) MID RLOW + RHIGH 2 RHIGH RLOW R1 = RMID + (1) R + R 2 R HIGH LOW R2 = R1 R MID (2) R1 ( R1 + RLOW RMID ) R3 = RLOW RMID (3) For example, setting the high set-point temperature at 35 C and the low set-point temperature at 15 C results in a middle set-point temperature ( )/2 = 25 C. Use the R-T table of a thermistor. R HIGH = 6.9kΩ R MID = 10kΩ MID R LOW = 14.8kΩ Note that Equation 1 to Equation 3 result in R1 = 17.5kΩ R2 = 7.5kΩ R3 = 81.3kΩ In order to reduce the injection current to the thermistor to reduce the errors caused by the self-heating effect, the injection current is provided in pulse mode, reducing the current by 10 times as opposed to a continuous current. It s recommended to connect R1 to 4VRS, and the controller will measure temperature at intervals that will reduce the error caused by the RTH self-heating. At the same time, the SBDN pin should be between 2.8V and 4V. See Table 3. We can also connect R1 to 4VR, but it may lead to some errors caused by RTH self-heating. At the same time, SBDN pin should be between 2.4V and 2.7V. See Table RTD RTD is short for resistance temperature detector, which features high accuracy and low drift. It usually generates heat when the current flows through the RTD, which is called self-heating effect. Moreover, RTD has an approximately linear resistance-temperature relationship. Figure 10. RTD Copyrights , Analog Technologies, Inc. All Rights Reserved. Updated on 5/17/

12 2. IC IC temperature sensor has lower self-heating effect. We use LM62BIM temperature sensor. The temperature range is from 10 C to 50 C, corresponding to T L = 0.636V, and T U = 1.260V. R1=16.4k, C1=4.7uF, R2=100k, R3 = 97.8k, R4 = 19.7k, R5 = 100k. See Figure 12. Figure 11. Linear Relationship between V TMO and Temperature R TD = R 0 ( T) e.g. R 0 = 1kΩ When T = 10 C, R TD (10) = kΩ When T = 40 C, R TD (40) = 1.154kΩ Choose R1 A. P RTD 1mW, R TD = 1000Ω P RTD = (I RTD ) Ω = 0.001W I RTD = 1mA = 4VR = R1+ R TD 4 R1=3kΩ R1+1k V V(TU) Figure 12. IC temperature sensor B. P RTD 1mW, R TD = 100Ω P RTD = (I RTD ) 2 100Ω = 0.001W I RTD = 3.16mA = V TMO = 4 R R1+ R TD TD 4VR = R1+ R TD R4 (R2 + R3) 1+ R2 R3 4 R1=1.15kΩ R1+ 0.1k 4 R4 R2 I. When T = 10 C, R1 = 3kΩ, R TD (T L ) = kΩ, R4 (2.97R3 1.03R2) 0.93 = R2 R3 When T = 40 C, R1 = 3kΩ, R TD (T U ) = 1.154kΩ, R4 (1.11R2 2.89R3) 2.79 = R2 R3 II. When T = 10 C, R1 = 1.15kΩ, R TD (T L ) = kΩ, R4 (2.1R3 1.9R2) 1.8 = R2 R3 When T = 40 C, R1 = 1.15kΩ, R TD (T U ) = 1.154kΩ, 1.9 = 2 R4 (R2 R3) R2 R3 V(TL) TL TU Figure 13. Temperature sensor IC characteristics V TMO (T L ) = 0.1V, V TMO (T U ) = 3.9V ΔV V( TMO) ( TU ) V( TMO) ( TL ) O G = = ΔVi V ( T ) V ( T ) R2 R5 G = = R1 R3// R4 V IM U V( TU ) + V( TL) 3.9V =, V V OM = = 2V 2 2 V =, V OM = 2V I V IM V I is the output voltage of IC, and V O is the voltage of TMO pin. L T Copyrights , Analog Technologies, Inc. All Rights Reserved. Updated on 5/17/

13 V Analog Technologies R2 R1 + R2 IN + = V im, V RTH = V IN + 4V V R3 V + V R5 VIN R4 IN + om IN + = + R5=100k, R1=R3//R4, R2=R5. R4 = 4G V R3 = V 400 V IN + IN + G V IN + IN + G SBDN SBDN is suggested to be pulled up to VPS with a 10µA current, and contains a 1.50V logic threshold. Drive this pin to a logic-high to enable the. Drive to a logic-low to disable the TEC controller and enter micro-power shutdown mode. ITEC and ILM When the voltage of the ITEC is V ITEC = 2V, the current of the TEC Controller I TEC =0A. When V ITEC = 0V, I TEC has the maximum reverse current, 15A. When V ITEC = 4V, I TEC has the maximum forward current, 15A. TEC controller is working on the cooling region, when it has forward current. On the opposite, it works on the heating region when reversing the current, as shown in Figure 14. I TEC 12A 12A I TEC Maximum TEC current 2V Figure 15. V ILM vs. I TEC 4V Allowable TEC current V ILM Figure 16. ILM vs. Cooling and Heating Control 12A Cooling region 0 Heating region 12A 2V 4V TEC+ TEC Figure 14. V ITEC vs. I TEC + TEC V ITEC I TEC The switch S1 is heating, and cooling Calculate the maximum current in cooling and heating region according to Figure Cooling region I TEC 0A, V ILM 2V, Cooling region => S1 = Open; Maximum cooling current: I TEC V ILM R2 15A = 15A 4V R1+ R2 2. Heating region I TEC < 0A, V ILM < 2V, Heating region => S1 = Close; Maximum heating current: I TEC MAX VILM R2//RILM 15A = 15A 4V R1+ R2//R 3. After deciding the heating current shrinking ratio, we can determine the value for R1 & R2. ILM Copyrights , Analog Technologies, Inc. All Rights Reserved. Updated on 5/17/

14 Calculate R1 & R2 ratio Analog Technologies I COOLMAX = R1 15A (1) R1+ R2 Calculate R1 & R2 value by deciding the heating current shrinking ratio: KHC = maximum heating current / maximum cooling current = I I ITEC-(TH-MAX) ITEC- (CL-MAX) (2) = = R2//R ILM R1+ R2//R R2 R1+ R2 ILM 200 (R1+ R2) R1 R (R1+ R2) VTEC and VLM VTEC = V TEC + V TEC, as shown in Figure 17. Figure 18. VLM vs. Cooling and Heating Control The switch S2 is heating, and cooling TMGD V TEC 30V Maximum TEC Voltage Range 2V 4V Cooling Range Allowable Output TEC Voltage range V VLM 30V Figure 17. V TEC vs. V VLM Heating Range Figure 19. TMGD Output Voltage Range The TMGD pin outputs the maximum source current and sink current of 20mA. The output current will cause voltage drop, see Figure 19. VLM and ILM If you want to use this TEC controller for other applications not discussed here, such as use it with wave locker controllers, and please consult with us. The same to other customizations, such as setting the ILM and VLM by using a voltage source swings above 4V and/or VPS. An external voltage connects the ILM pin through a resistor. This voltage can be used to adjust the voltage range of cooling or heating, and advice is 1.5V. The resistor can be used to adjust the difference of cooling and heating, and advice is 10kΩ. See Figure 20. Copyrights , Analog Technologies, Inc. All Rights Reserved. Updated on 5/17/

15 For example, the voltage midpoint of the ILM pin (V m ) is 2V. Adjust the external voltage, and make the voltage range is 1V, but it is only with the center of 2V (V m ). If you adjust the resistor W2, it can be moved the limit of the cooling to be greater than the limit of the heating. It is shown in Figure 21 and Figure 22. 4VR W1 20k + W2 10k R ILM 10k ADC C1 2.2uF S1 Figure 20. ILM vs. Cooling and Heating Control 2 ADC Contro l Figure 23. The Waveform on the VLM or ILM SB State Figure 21. Adjust the External Voltage Figure 24. The Waveform on the VLM or ILM Operation State We can tell the VLM or ILM voltage in cooling control or heating control through the waveforms on the VLM or ILM pin, see Figure 23 and Figure 24. The duty cycle in Figure 23 is 99% and 1% in Figure 24. We can also measure both voltages by a multimeter. When the controller is in the Standby State, the voltage measured by the multimeter is the VLM or ILM voltage in cooling control. When the controller is Operation State, the voltage measured by the multimeter is the VLM or ILM voltage in heating control. Temperature Network comes with a customized internal compensational network for which the component values are specified by the customer. See Figure 8. comes with a customized Temperature network. See Figure 8 and Figure 9. Figure 22. Adjust the Resistor Copyrights , Analog Technologies, Inc. All Rights Reserved. Updated on 5/17/

16 TYPICAL CHARACTERISTICS Table 4. Measurement Data of Rth vs. Temperature Temp. ( C) Rth (kω) TMO (V) Ideal linear (V) Error Temp. ( C) Rth (kω) TMO (V) Ideal linear (V) Error Figure 25. TMO Pin Voltage vs. Set-point Temperature Copyrights , Analog Technologies, Inc. All Rights Reserved. Updated on 5/17/

17 MECHANICAL DIMENSIONS The controller comes in 2 packages: through hole mount and surface mount. The former is often called DIP (Dual Inline package) or D (short for DIP) package and has a part number: D, and the latter is often called SMT (Surface Mount Technology) or SMD (Surface Mount Device) package and has a part number: S. Dimensions of this controller is shown in Figure 26 and Figure 27. Figure 26. Dimensions of DIP Package Copyrights , Analog Technologies, Inc. All Rights Reserved. Updated on 5/17/

18 Figure 27. Dimensions of SMT Package ORDERING INFORMATION Table 5. Part Number Part Number D S SNCOD SNCOS Description High voltage high current TEC controller with Pin 1 4VRS in DIP package High voltage high current TEC controller with Pin 1 4VRS in SMT package High voltage high current TEC controller with Pin 1 SNCO in DIP package High voltage high current TEC controller with Pin 1 SNCO in SMT package Table 6. Unit Price Quantity (pcs) D $272 $258 $242 $228 $212 $198 S $272 $258 $242 $228 $212 $198 SNCOD $272 $258 $242 $228 $212 $198 SNCOS $272 $258 $242 $228 $212 $198 Copyrights , Analog Technologies, Inc. All Rights Reserved. Updated on 5/17/

19 NOTICE 1. ATI warrants performance of its products for one year to the specifications applicable at the time of sale, except for those being damaged by excessive abuse. Products found not meeting the specifications within one year from the date of sale can be exchanged free of charge. 2. ATI reserves the right to make changes to its products or to discontinue any product or service without notice, and advise customers to obtain the latest version of relevant information to verify, before placing orders, that information being relied on is current and complete. 3. All products are sold subject to the terms and conditions of sale supplied at the time of order acknowledgment, including those pertaining to warranty, patent infringement, and limitation of liability. Testing and other quality control techniques are utilized to the extent ATI deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily performed, except those mandated by government requirements. 4. Customers are responsible for their applications using ATI components. In order to minimize risks associated with the customers applications, adequate design and operating safeguards must be provided by the customers to minimize inherent or procedural hazards. ATI assumes no liability for applications assistance or customer product design. 5. ATI does not warrant or represent that any license, either express or implied, is granted under any patent right, copyright, mask work right, or other intellectual property right of ATI covering or relating to any combination, machine, or process in which such products or services might be or are used. ATI s publication of information regarding any third party s products or services does not constitute ATI s approval, warranty or endorsement thereof. 6. IP (Intellectual Property) Ownership: ATI retains the ownership of full rights for special technologies and/or techniques embedded in its products, the designs for mechanics, optics, plus all modifications, improvements, and inventions made by ATI for its products and/or projects. Copyrights , Analog Technologies, Inc. All Rights Reserved. Updated on 5/17/